Time Between Dates Calculator
Instantly calculate the exact duration between two dates in days, weeks, months, and years. Includes business and working day calculations.
Calculate Date Differences
Enter your start and end dates to instantly see the total duration, broken down into precise years, months, weeks, and days.
Duration Estimator
Find the exact time span between any two calendar dates.
How it Works
Understanding date duration calculations
Select Your Dates
Choose the start and end dates using the calendar pickers. You can swap them instantly if you get them backwards.
Adjust Inclusion
Toggle “Include end date” if you need the final day counted (common for hotel stays or event durations).
Choose Business Days
Enable “Business days only” to automatically filter out Saturdays and Sundays for working day calculations.
View the Breakdown
Get an instant, precise breakdown of years, months, weeks, days, and total hours between your selected dates.
Time Conversion Cheat Sheet
Common time duration conversions to help you estimate date differences manually or verify your results.
| Time Unit | Equivalent In Days | Equivalent In Hours | Notes |
|---|---|---|---|
| 1 Week | 7 days | 168 hours | Exactly 7 consecutive days. |
| 1 Month (Average) | ~30.44 days | ~730.5 hours | Based on 365.25 days / 12 months. |
| 1 Standard Year | 365 days | 8,760 hours | Excludes leap years. |
| 1 Leap Year | 366 days | 8,784 hours | Occurs every 4 years (adds Feb 29th). |
| 1 Business Week | 5 days | 120 hours | Monday through Friday only. |
| 1 Quarter | ~91.31 days | ~2,191.5 hours | Exactly 3 calendar months. |
Date Calculator FAQ
Answers to the most frequently asked questions about calculating time between dates, business days, and inclusive counting.
To calculate the time between two dates, subtract the start date from the end date. This gives you the total difference in milliseconds, which can then be converted into days, weeks, months, and years. Our calculator handles leap years and varying month lengths automatically for precise calendar-based results.
By default, date calculations exclude the end date (e.g., the time between Monday and Wednesday is 2 days). However, you can check the ‘Include End Date’ option in our calculator to make it inclusive, which is useful for booking accommodations, counting leave days, or calculating total days of an event.
Business days (or working days) are calculated by counting only the weekdays (Monday through Friday) between the start and end dates, automatically excluding Saturdays and Sundays. Please note that public or bank holidays are not automatically excluded, as they vary significantly by country and region.
Yes. The calculator provides a precise breakdown of years, months, and remaining days. It accounts for the varying number of days in each month (28, 29, 30, or 31) and leap years, giving you an accurate calendar-based duration rather than a simple mathematical average.